Chiba and Conan silently walked in the hallway of the school building.

"The one on the sixth floor is back in the stairwell," Qian Yu said softly as she looked at the signal board, glanced at the stairwell next to her. "Right above us."

The sound of footsteps was already in the ears of Conan and Chiba, who were listening intently—louder and louder.

“？” Thousand Feathers looked at Conan suspiciously. "We're not going to be discovered, are we?"

"I don't know." Conan does lip syncing.

After a dozen seconds of torment, it finally disappeared.

"Whew-" Chiba let out a sigh. "Finally—"

The second half of the sentence was eaten back into his stomach, because on the handrail of the stairs in front of him, a bright red liquid appeared out of thin air.

“！！！” Chiba was so frightened that he almost fell down the stairs, but fortunately his right hand was still firmly grasped on the stairs. "This..."

Chiba looked in amazement at the blood that flowed along the handrail, split into two strands by his own hand. "How can there be blood here?"

"You... Conan walked up behind Chiba speechlessly, and dipped his fingers in some red liquid. "Do you have a cold?"

"No," Qian Yu was stunned. "Ask me what I'm doing here?"

"Stupid! You don't have a cold, you can smell it, right? Have you ever seen blood that doesn't smell like blood? Conan had a "damn retarded" look on his face. "It's just paint...

“。。。” Chiba put her hand in front of her nose and sniffed it. "Okay... Looks like the one on the sixth floor spotted us? ”

"Perhaps, the sound we heard closing the window earlier was made by him." Conan said thoughtfully. "That's when he saw us."

"So what do we do now?" Qian Yu frowned. "Just go up?"

"What about the other one?" Conan squinted. "Let's go see the third floor first, and then go upstairs."

"Now he's in the health room," Qian Yu glanced in the direction of the health room on the third floor. "Go?"

"Late will change." Conan replied, and immediately walked up the stairs.

He entered the stairwell opposite, not knowing whether to go upstairs or downstairs. When he walked to the second floor, Qian Yu looked at the signal light board in his hand and glanced at the corridor directly opposite.

"We'll wait here," Conan pointed to the opposite side. "The stairwell over there is facing us, and if he comes down, we can see who he is."

"Hmm... Chiba leaned on the handrail and looked at the stairwell opposite.

A figure appeared, but it had begun to darken, and the two could only see the figure in shadows, but they could not see who he was.

"Chase!" Conan immediately ran to the stairwell opposite, and Chiba immediately followed.

But... If he hears our footsteps and runs, we can't seem to catch up with him... In the process of pursuit, Qian Yu suddenly remembered this question.

But that must also be chased, you can't just watch him escape, right? Thousand Feathers rolled her eyes and continued to follow behind Conan.

When he arrived at the stairwell opposite, Qian Yu felt the entrance of the stairwell directly one step ahead of Conan and glanced inside.

"Uhh Chiba's scream made Conan's heartbeat almost skip a beat.

"What's wrong?" Conan asked Chiba as he came to the entrance of the stairwell. When she looked into the stairwell, she was equally startled.

A man with his whole body stripped of his skin was standing on the stairs, looking at them coldly.

"It's... Qian Yu unfolded the Traceless Umbrella halfway and looked at the man in front of him in horror.

"Who is he... Conan muttered.

At this moment, the sharp-eyed Conan saw a slightly smaller figure behind the man trying to hide himself in the man's shadow.

"Don't panic," Conan actually laughed. "Qianyu, take a closer look, this is the dummy in the health room!"

"Dummy?" Qian Yu was stunned for a moment, and after careful observation, he found that this was just a dummy, and there was a woman they were very familiar with hiding behind the dummy!

"Mr. Kobayashi?" Chiba and Conan were dumbfounded.

"Edogawa-san and Tachibana-san?" Chiba and Conan's homeroom teacher, Sumiko Kobayashi, asked in surprise as she appeared in her original form under the light of the flashlight. "You ... How did you end up here? ”

"Why are you here?" Qian Yu said in surprise. "Why are you here with this dummy?"

"The teacher is preparing for the lesson... Kobayashi Sumiko said embarrassedly. "The teacher is used to putting a few dummies or avatars in the classroom when preparing for class, so that it will have a more atmosphere~"

"Preparing for class..." The corners of Chiha's mouth twitched. "Do you use something so scary...

"Tachibana-san," Kobayashi Sumiko looked at Chiha's almost bloodless face with interest. "Are you afraid of ghosts?"

Conan also looked at Chiba playfully when he heard this question.

"Whew..." Chiba spread his hands and looked at Chiba and Kobayashi Sumiko innocently. "I'm afraid of ghosts... You don't have to be so short, right? ”

Suddenly, Qian Yu noticed that on the signal light board in his hand, a row of signal lights representing the first floor flashed one after another - someone was running wildly on the first floor! Qianyu had been holding the signal board with both hands just now, so he didn't notice this anomaly at all!

After discovering that there was no signal on the sixth floor, Chiba was basically sure of what had happened.

The guy who had been on the sixth floor had just run down the stairwell and slipped away from the first floor!

Qian Yu was about to chase after him, but when he found that the signal light that symbolized the main entrance was on, he could only shake his head self-deprecatingly.

The man on the sixth floor ran away.

。。。

When Chiba and Conan opened the school gate with the help of Mr. Kobayashi and left Teidan Elementary School with Mitsuhiko Mototabu, Chiba found an opportunity and asked Conan a question.

"Conan," Qian Yu asked with a curious expression. "You know that highly decomposed corpse in the chamber?"

"That..." Conan hooked Chiha's shoulders and led him away from the other three. "We should know ... Although the corpse was highly decomposed, I really couldn't think of a second person from Didan Elementary School who met this condition. ”

"At Didan Elementary School, a teacher resigned on April 6 on the grounds of marriage at the beginning of the semester, so the new homeroom teacher took over her class on April 11."

"How do you know so well?" Qian Yu wondered.

"The name of the new homeroom teacher is called," Conan's tone was low. "Sumiko Kobayashi."

“！！！” Chiba looked at Conan in surprise.

"That's right," Conan nodded. "I suspect this corpse is our former homeroom teacher, Toya-sensei!"

(Changed Toya-sensei to long hair =,= Don't care about these details)